Beechcraft C-12C, Operator And Technical Reference Manual

Page: 197 / 949

TM 1-1510-218-10
3-43
3. Press the ENT button to approve the
waypoint page and activate the
waypoint. The selected course does
not change; therefore, this method
does not re-center the deviation bar
like a DIRECT TO operation.
CAUTION
The KLN 90B obtains approach information
from the database. It is extremely
important that the database is current. The
KLN 90B is approved for IFR non-precision
approaches only when the database is
current. If an approach is selected when
the database is out of date, a status line
message, OUTDATED DATABASE, will
display in the bottom center of the screen.
ACTIVATE:
FINAL
INT
FINAL
REF: BTV
RAD: 292.8
o
DIS: 11.7NM
N 44
o
25.40’
W 73 o 27.20’
ENR : 090 ENT
CRSR
The Super NAV 5 page has been specifically
designed to provide most of the functions needed for
non–precision approaches. This page provides an
interface that presents pertinent navigation
information, a way to access the flight plan, and a
graphic presentation of the present position relative to
the flight plan waypoints.
Figure 3-55. Activating a Waypoint
NOTE
(8) Changing The CDI Scale Factor. The
CDI scale factor can be changed by using either the
MOD 1 or MOD 2 pages. In normal operation, it is
possible to select a CDI scale factor which is
±
5 nm, 1
nm, or 0.3 nm full-scale defection.
There are some approach procedures that
are not suited for the operational
characteristics of the KLN 90B. These
procedures are not included in the
database. Ensure that the KLN 90B
contains anticipated procedures for the
flight.
NOTE
The KLN 90B will automatically select a
scale factor while in one of the approach
modes. When the KLN 90B selects a CDI
scale factor, it is not possible to select a
scale factor that is less sensitive.
In addition to the LEG and OBS course modes,
there are also two approach modes. These are
approach arm and approach active. The status of the
approach mode is indicated both on the external
switch/annunciator and on the status line of the KLN
90B. The external annunciator will indicate ARM for
the approach arm mode and approach active will be
annunciated by ACTV. The main difference between
these modes from the normal en route mode is that
the integrity monitoring is set to a tighter level.
Another difference between these modes and the en
route modes is that the CDI scale factor will usually
change to ± 1.0 nm for ARM and will always change to
± 0.3 nm when in the APR ACTV mode.
1. Select either the MOD 1 or MOD 2
page.
2. Press the left CRSR button. If
necessary, use the left outer knob to
move the cursor over the value of the
CDI scale.
3. Rotate the left inner knob to select the
desired scale factor.
The ARM mode can be selected in two ways.
The normal way is that this mode will be selected
automatically by the KLN 90B when the aircraft is
within 30 nm of the destination airport and an
approach for that airport has been loaded in the flight
plan. It is possible to arm the approach mode at a
distance greater than 30 nm from the airport by
pressing the
GPS APR switch, but the KLN 90B will
not change the CDI scale factor until the aircraft
reaches the 30-nm point. If the
GPS APR external
switch is pressed while the approach mode is armed,
the KLN 90B will disarm the approach and change
back to en route mode. The CDI scale factor will also
4. Turn the left cursor function off.
am. Non-Precision Approach Operations. The
message/waypoint annunciator is the primary navaid
selector to select which navigation source is displayed
on the pilot's HSI, the course mode selector/
annunciator, to select the LEG or OBS modes, and the
approach mode selector/annunciator, to arm and
annunciate the approach modes, must be operational.